

It doesn’t have to be, but if all Linux apps were standalone binaries, installing apps would be a PITA. Flatpaks have better integration with the desktop environment (like automatically handling desktop shortcuts), can share runtimes to save space, have a standardized way of handling permissions and launch options, etc. The Linux world is moving towards flatpaks for many reasons, and the Tor Browser flatpak is marked as official from the Tor Project. Wouldn’t it be reasonable to expect it to work, and to get some sort of notification if it breaks?
Afaik the notification was suppressed, see the linked github issue in the post, or this one. I can guarantee the notification wasn’t there on my end or else I would have noticed it